This study was carried out from December 2007 to November 2008 in Karoon River in Khuzestan Province. From the total number of 578 specimen 53, 58 were females and males respectively, and 125 specimen were immature (Barbus barbulus), also 51, 62 were males and females, and 229 were immature (Barbus pectoralis). Samples were caught by cast nets and fixed gill net. Total length, age, sex, and maturity of the fish were determined.
Lenght range of B. pectoralis was 945-200 mm.
range was 885-230 in length.
Spawning season of B. pectoralis is determined by using the GSI, and the analysis of data showed it to be February (Bahman) and for B. barbulus to be March (Esfand) in Shushtar station.
LM50 of male and female of B. barbulus is determined 45-50cm, 50-55 cm respectively. This was identified for B. pectoralis male and female 35- 40 cm and 50-55 cm respectively.
First maturity of male and female of B. pectoralis observed at 35-40 cm and 40-45 respectively. This was identified for B. barbulus male and female 30- 35 cm, 40-45 cm respectively.
Maturity age of male and female of B. pectoralis is determined 3+, 4- respectively. This was identified for male and female of B. barbulus 2+, 3- respectively.
Sex ratio of B. pectoralis and B. barbulus is using chi square test, (male/female) as 1/1:1 and 1:1 respectively.